Filter



April 15, 1952 E. A. FAILMEZGER 2,592,528

FILTER Filed April 1, 1947 3 Sheets-Sheet l INVENTOR. EUGENE A. FAILMEZGER W M LMW.

A T TOR NEYS.

A ril 15, 1952 E. A. FAILMEZGER FILTER 3 Sheets-Sheet 2 Filed April 1, 1947 INVENTOR. I EUGENE A. FAILMEZGER ATTORNEYS.

A ril 15, 1952 E. A. FAILMEZGER 2,592,528

FILTER Filed April 1, 1947 s Sheets-Sheet 3 INVENTOR. EUGENE A. FAILMEZGER A TTORNEYS.

Patented Apr. 15, 1952 UNITED STATES PATENT OFFICE I'FILTEE :Eugene ;;A. iFailmezger, Syracuse, .:N. .Y.,: assignor to U. srHoffman'. Machinery 'Corporatiomsyra .cusc, .N. 1., ca morporationizofaDelaware ,ApplloatioirApril 1, 1947,"T.SerialfNo.73852 spams. 1

Thi invention 'relates to filters, and more in '-'particular'ito disc filters of'the type which are use'd"'for filtering lubricating 'o'il'in an engine.

The present invention relates to the 'copend- 'ing application of 'Francis J. Armstrong, filed"- December 7,1945, Serial lid-633,343. An object of this invention is to provide "a filter which'is light 'in weight, sturdy in "construction, inexpensiveto manufacture and maintainand which "is 'rea'di'lyadaptable for use underla widevariety of conditions. Afurther object is 'to'provide a "filter-of "the character disclosed in the above- 'identified-"copending application which will'be particularly-suitable"for mass production. These and other objects wlll'be in part obvious and -;in part pointed out below.

The invention accordingly consists in the fea- 'tures or construction, combinations of elements, *and'arrangements-of parts as=will be exemplified in'"the'-'structure to'be hereinafter descr'ibedand the sc'ope ofthe application of which willbe indicatd in the following "claims.

In'the drawings: Figure "1 is'a' vertical'section of "a filter unit constituting one embodiment of the-invention;

FigureQ'is-an exploded view of theupper'por- -tionof' thecasin'g construction showing the casing proper removed from the top or lidiportion;

Figure 3 is'a top plan view;

Figure-4 is a plan view'of one of the filter discs; and

Figure 'fi isiasectional viewon the line ii- 5 :of Figure 4.

:Referring particularly to Figures 1 "and 3 of the :drawings, a 1 cylindrical casing 2 is formed by a main casing 4 and a top or-lidportiont. Thelid portion provides the mounting for the :filterunitiand for thispurpose 1(see Figure 3) there are two angle brackets-8 integral with the lid portion. These brackets are provided with holes V I0, :shown in broken. lines, through which 1stud:bolts '(not'shown) extend: and: are threaded into::the 'base of theLmachine to which the .fllter a unitis5attached.

:Casing A'is-attached-to lid portion Bby interengaging'fianges'on the two members; accordtin lyrlid portion i6 has four-flanges l2, each of 'which has tan :arcuate extent of approximately 45. Flanges l2 are separated from each other by slots 1 4-an'd above thefiangesisan annular groovelfi. .Casinga l has:on;its upper .end asimilar :mating "structure :.formed :by four :arcuate ffianges l8 separated bysslots :and having beineathithem an annular groove 22 "and .a flange 124.

,The top of the casing :has za 'peripheral 1 groove '25 in which" ispositioned'ia rubber sealing ring128 which cooperates witha'cylindrical surface :2in "the lid portion.

In 'assemblingithe casing to the, lid portion,;the upper end of the casing is inserted into the; lid portion with flanges 58 positioned in alignment with'slots l4; and,ithe'arrangement is suchthat these flanges pass snugly through the "slots into the annular groove l6, and flanges 12 pass through slots'zflsinto groove 22. With the :casing thusupositionedjitviis rotated through an angle of 45, with the result :that each of flanges l8 vridesiover' the top of aifiange J2. Atlthis'time, sealing ring 2811s spread by engagement with surfaced 011 so as to provide 'aiseal, and the inter- :engagement of the pa'rtsi is such that :a snug: fit

is .provided andtthe casing i is securely held Li place.

Casing t carries an upwardly projecting braoketr32 (Figures 2 and 3) which'is carried by .theouteredge ofiflange 24, and lid portion 5 icarriesiapair .of stop lugs 34Vand36. When the top :of :theica sing is beingiinserted into thellid portion, bracket '32 is positioned as shown in i .Figurefiadjacent lug 34, andwhen'so positioned over its flange i2 as explained above.

-the:flanges are inalignment with "the respective grooves as explained above. Then when the casi'ilgiiS fullyxinserted into the lid portiornit is'rohore 46 in slid portionfipand the other end: the

mandrel isresilientlyv held by: a cupAZa-ndza comv ,pression spring A4. ."Ihisrspring rests'againstcas- Sing diandlfits over alug :45 .integral'with casing.

As shown bestjn Figure 5, each of filteriele- .ments 31.isiormedbytwo identical oppositely :disposedmetal discs :59 and ,two enclosing ;.felt .1discsi152 which are stitched together ;at':the :pe-

iriphery. at :54 and are held'in spaced relationship .by' the "discs. The mainiportion of each :disc 50 55 oistfrustoeconical,.:but:at the center the idiscsiare the ofiset toward each other to the plane or the outer periphery of the discs to provide mating flanges 56. Furthermore, each disc has four radial reinforcing bosses 58 which extend to the plane of flanges 56 and the peripheral edges of the discs. Thus, the two discs contact each other at their inner and outer peripheries and at bosses 58 so as to provide an annular space 59 therebetween. This space is wedge-shaped in radial crass-section with the narrow portion at the outer edge.

Referring now to Figure 1, the filter elements 31 are held in alignment by mandrel 38; and, the mandrel is permitted slight axial movement so that spring 44 exerts pressure through the peripheral flange of cup 42 against the lower filter element so as to compress the stack of filter elements against the sleeve 6'2 around arbor 40. The filter elements are held rigidly at their inner peripheries with the adjacent annular portions of the felt discs 52 contacting one another. The force exerted by spring 44 is sufficient to prevent the passage of contaminated oil between the filter elements so that an oil seal is provided. The unfiltered lubricating oil enters the top of the filter unit through a pipe connection at a threaded bore 64 and the filtered oil is withdrawn through a pipe connection at a similar threaded bore 65 in alignment with mandrel 38. The filter unit is normally mounted in the upright position shown, and the bottom of easing 2 is a drain plug 68 by Which the filter unit may be drained.

Each filter element presents two frusto-conical filter surfaces formed by felt discs through which the oil passes into the annular space 59, and in passing through the felt disc the oil is filtered. The perforated discs 50 provide ample support for the felt discs but yet they permit the free passage of the oil into space 59. Within space 59 the oil passes radially inwardly toward mandrel 38, and at the disc flanges 56 the oil again passes through perforations in the discs and it then enters the mandrel through the perforations therein. Thus, the unfiltered oil passing into casing 2 is filtered by the passage through a single layer of felt and the filtered oil is drained to the mandrel. The filter unit presents a filter area to which the unfiltered oil has access, which is substantially the entire area of all of the felt discs, and the filtered oil is drained in an eificient manner from the entire surface of the opposite side of each of these felt discs. Therefore, a relatively large volume flow may be obtained with a mini mum pressure drop and with minimum danger of stoppage.

As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment set forth, it is to be understood that all matter hereinbefore set forth, or shown in the accompanying drawing, is to be interpreted as illustrative and not in a limiting sense.

I claim:

1. In a filter unit, the combination of, a casing construction formed by a lid portion and a shell portion which have interengaging open lugs which may be disengaged by rotating the shell portion with respect to the lid portion, a stop assembly comprising a pair of spaced stops on said lid portion and a singlebracket on said shell portion which is adapted to be positioned between said stops and is adapted to limit the turning movement of the shell portion with respect to the lid portion, said lid portion having a central outlet opening and a side inlet opening, a

perforated sleeve mandrel coaxially positioned with respect to said outlet opening, a, plurality of disc filter elements positioned on said mandrel, and a retaining cup and spring assembly projecting into said mandrel at the end thereof opposite said outlet opening and compressing said filter elements at their inner peripheries.

2. A filter unit as described in claim 1 wherein said interengaging lugs on the casing portions include four peripheral lug portions on each of the portions which are adapted to be positioned in interengaging relationship when the shell portion is in one extreme position and which are out of engagement with each other when the shell portion is in its other extreme position as limited by said stop assembly.

3. In a filter unit, a casing formed by a main cylindrical shell portion which is closed at one end and open at the other end and a cover portion which mates with and closes said open end, said cover portion having a collar which snugly receives the open end of said shell portion, said shell portion having a peripheral groove in the outer surface thereof, a sealing ring positioned in said peripheral groove and forming a seal between said open end and the cover portion, said collar having an internal groove formed by a flange assembly including a plurality of circumferentially spaced arcuate flanges having slots therebetween, said shell portion having a plurality of arcuate lugs corresponding in number to the number of said slots and adapted to pass through said slots into said groove as the open end of the cylindrical shell portion is projected into said collar, said lugs being adapted to be snugly received in said groove and cooperating with other parts of the casing to form a rigid interengaging relationship with said flange assembly, a stop assembly to limit the relative movement between said shell portion and said cover portion, means for introducing liquid to be filtered into said casing, and means for withdrawing the filtered liquid from the casing.

4. A filter unit construction as described in claim 3 of the type wherein a plurality of filter elements are used, and means to hold the filter elements in axial alignment comprising, a flanged cup engaging the end filter element adjacent the closed end of the shell portion with its flange overlying the inner annular portion of the adjacent filter disc, and a compression spring pressing at one end against said cup and at the other end against said shell portion thereby to hold the filter elements in sealing relationship and also to urge said shell portion away from said cover portion.

5. In a leaf-type filter unit, a casing comprising, a cylindrical shell portion which is closed at one end and open at the other end, and a lid portion adapted to mate with and close said open end of said shell portion, said shell and lid portions having a plurality of interengaging open lugs which may be engaged and disengaged with each other by relative rotation of said shell and lid portions, and a stop structure to limit said rotation; a filter assembly within said shell portion comprising a perforated sleeve mandrel, and a plurality of disc filter elements positioned on said mandrel; a retaining spring assembly comprising a compression spring, a cup for one end of said mandrel adapted, together with positioning means on the inner surface of the closed end of said shell to position the ends of said spring therebetween, to seal th ends of said mandrel and to force said discs into sealed relationship 5 6 at their inner peripheries, whereby liquid to be UNITED STATES PATENTS filtered can enter said mandrel only by passing Number Name Date through said filter discs; and means for introduc- 1,365,167 Gates Jam 11, 192,1

ing liquid to be filtered into Said Cas g and fo 1 4 512 Pickard May 12 1931 withdrawing filtered liquid from said sleeve mark 5 1 9 9 795 Fellows 5 935 drel- 20571932 Bolser Oct. 20, 1936 EUGENE FAILMEZGER- 2,304,618 Williams Dec. 8, 1942 2,368,795 Wittenberg 'Feb. 6, 1945 REFERENCES CITED 2,427,320 Zech Sept. 9, 1947 The following references are of record in the 10 2,430,078 Reinseh et a1. Nov. 4, 1947 file of this patent: 2,491,144 Yankovitch Dec. 13, 1949 

